Abstract: In this talk I will present a new application of motivic homotopy theory: motivic knot theory. More specifically, I will present the quadratic linking degree, which is a counterpart in algebraic geometry of the linking number of two oriented disjoint knots (the number of times one of the knots turns around the other knot). To do this, I will recall some notions from knot theory and from quadratic intersection theory, and I will give several examples during my talk.